Answer:
Innate immunity is a nonspecific defense mechanisms that play its role as soon as an antigen appear in the body (it is relatively rapid but nonspecific and because of that it is not always effective)
Explanation:
The barries of innate immunity are:
Skin: At Epidermal surface, its protective aspect are keratinized cells that lives on the surface, known as Langerhans cells.
Skin sweat or secretions: Their specific defense is sweat glands and sebaceous glands, and their protective aspect is low ph and washing action.
Mucosal surfaces: they are at the mucosal epithelium, and their protect aspects are nonkeratinized epithelial cells.
Oral cavity: They defend salivary glands through Lysozyme
Natural selection is a process where living things that are better adapted to the environment around them survive longer and produce more off springs .
This question isn't really finished, but bacterium are unicellular prokaryote.
I hope this helps?.. :S
<span>Homologous (This means they are the same chromosome from each parnet, matched together) </span>
<span>Altruism is a selfless behavior so the animal would behave that way because it's intention is to put others before itself.
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